Criss-crossing lines in UML diagrams

[Ishan De Silva]

Hi,

It seems that UML suggests to use a "jump" (as in an electrical
circuit), if one gets a situation where crossing-lines cannot be
avoided.

Is there a way of duplicating UML elements such as use cases, classes
etc. to avoid criss-crossing lines? (I mean a duplicating notation as
in structured notation SSADM)

If duplication is not allowed, is there a particular reason for it?

Thanks,
Ishan.

[Phlip]

Post by Ishan De Silva
It seems that UML suggests to use a "jump" (as in an electrical
circuit), if one gets a situation where crossing-lines cannot be
avoided.
Is there a way of duplicating UML elements such as use cases, classes
etc. to avoid criss-crossing lines? (I mean a duplicating notation as
in structured notation SSADM)
If duplication is not allowed, is there a particular reason for it?

Why does your UML diagram have so many elements that lines cross?

Try using a solid dot to link lines that connect. Or, only route lines from
node to node.

[Ishan De Silva]

Post by Phlip
Why does your UML diagram have so many elements that lines cross?

Well this is not what I expected. One can ask, Why can't you break up
the diagram to have a manageable number of elements?, Why don't you
revisit the desgin? etc.

But mine was a question on UML syntax. Is there a way to *duplicate*
elements? If not, why?

Post by Phlip
Try using a solid dot to link lines that connect. Or, only route lines from
node to node.

Anyway, I'm not clear what you mean here.

Thanks,
Ishan.

[Robert C. Martin]

Post by Ishan De Silva
Hi,
It seems that UML suggests to use a "jump" (as in an electrical
circuit), if one gets a situation where crossing-lines cannot be
avoided.
Is there a way of duplicating UML elements such as use cases, classes
etc. to avoid criss-crossing lines? (I mean a duplicating notation as
in structured notation SSADM)
If duplication is not allowed, is there a particular reason for it?

Duplication is allowed.

|A|<-----|B|----->|C|----->|A|




-----
Robert C. Martin (Uncle Bob) | email: ***@objectmentor.com
Object Mentor Inc. | blog: www.butunclebob.com
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800-338-6716


"The aim of science is not to open the door to infinite wisdom,
but to set a limit to infinite error."
-- Bertolt Brecht, Life of Galileo

[Universe]

Post by Robert C. Martin

Post by Ishan De Silva
Hi,
It seems that UML suggests to use a "jump" (as in an electrical
circuit), if one gets a situation where crossing-lines cannot be
avoided.
Is there a way of duplicating UML elements such as use cases, classes
etc. to avoid criss-crossing lines? (I mean a duplicating notation as
in structured notation SSADM)
If duplication is not allowed, is there a particular reason for it?

Duplication is allowed.
|A|<-----|B|----->|C|----->|A|

Just please avoid actual separate duplicate package classes--as some
XP'ers incredibly advocate.

Elliott